An W C, Li X M
College of Environmental Science and Engineering, Shandong University, Jinan 250100, People's Republic of China.
Environ Monit Assess. 2009 Jan;148(1-4):173-84. doi: 10.1007/s10661-007-0149-6. Epub 2008 Mar 15.
Phosphorus fractions and phosphate adsorption characteristics of 16 sediments from a shallow freshwater lake (Nansi Lake, China) and its inflow estuaries were investigated. In the present study, the sediment phosphorus is fractionated into exchangeable P (exch-P), Al-P, Fe-P, Ca-P, organic P (OP), inorganic P (IP) and total P (TP). The results show that the total phosphorus (TP) content in the sediments ranges from 571.67 to 1,113.55 mg kg(-1), and calcium bound phosphorus (Ca-P) is the main fraction of IP. The biologically available phosphorus (BAP) ranges from 32.02 to 229.67 mg kg(-1) in the Nansi Lake sediments. Phosphate adsorption on the sediments mainly occurs within 10 h and is completed within 48 h. The content of native adsorbed phosphorus (omega(NAP)) varies greatly from 6.05 to 194.37 mg kg(-1), showing a significant correlation with the total maximal amount of phosphorus adsorbed (TQ(max)). Adsorption efficiency (m) ranges from 574.79 to 3,220.68 l kg(-1) and zero equilibrium phosphorus concentration (C(EPC)) ranges from 0.010 to 0.157 mg l(-1). After the South-to-North Water Diversion Project, the inherent phosphorus present in sediments will be a major threat to the diverted water quality and be a predominant factor determining the trophic status of the lake even if the external load is reduced.
对中国南四湖及其入湖河口16个沉积物样品的磷形态和磷酸盐吸附特征进行了研究。在本研究中，沉积物中的磷被分为可交换态磷（exch-P）、铝结合态磷（Al-P）、铁结合态磷（Fe-P）、钙结合态磷（Ca-P）、有机磷（OP）、无机磷（IP）和总磷（TP）。结果表明，沉积物中总磷（TP）含量在571.67至1113.55 mg kg⁻¹之间，钙结合态磷（Ca-P）是无机磷的主要组分。南四湖沉积物中生物可利用磷（BAP）含量在32.02至229.67 mg kg⁻¹之间。沉积物对磷酸盐的吸附主要在10小时内发生，并在48小时内完成。天然吸附磷（ω(NAP)）含量变化很大，在6.05至194.37 mg kg⁻¹之间，与最大吸附磷总量（TQ(max)）显著相关。吸附效率（m）在574.79至3220.68 l kg⁻¹之间，零平衡磷浓度（C(EPC)）在0.010至0.157 mg l⁻¹之间。南水北调工程实施后，即使外部负荷降低，沉积物中存在的内源磷仍将对调水水质构成重大威胁，并成为决定湖泊营养状态的主要因素。
